陆上颗粒状滑坡海啸能量传递的二维数值分析

IF 4.5 2区 工程技术 Q1 ENGINEERING, CIVIL
Alessandro Romano , Giorgio Bellotti , Gabriel Barajas , Javier L. Lara
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引用次数: 0

摘要

由山体滑坡引起的海啸对沿海、峡湾和湖泊环境构成了重大危害。它们使用物理和数学模型进行准确建模,对于风险评估和减轻战略等活动至关重要。这两种方法都可以为滑坡海啸的物理学提供有价值的见解;然而,由于问题的复杂性,需要更多的努力来进一步了解海啸产生和传播的基本过程。从这个意义上说,从能量的角度研究这个问题可以提供有价值的信息,特别是关注滑坡和水波之间的能量传递机制。本文提出了一种二维数值研究方法,旨在研究由地面颗粒状滑坡引起的海啸的能量映射。为此,使用OpenFOAM®进行了几个参数模拟,系统地改变了一些选定的控制参数(滑坡下降高度、水深和坡度角)。对于每个模拟,计算和分析了几个无量纲能量,以研究滑坡与水波之间的能量传递机制。此外,还研究了一些参数描述海啸产生和传播的能量传递过程效率的能力。至少在本研究中考虑的情况下,就海啸产生效率而言,冲击时滑坡垂直锋的形状和淹没路径的范围似乎比冲击时滑坡速度更重要。最后,从更广泛的角度对合成能量进行了研究,以获得对地面颗粒状滑坡和海啸之间能量传递过程的总体见解,从而形成了无因次能量波源曲线的第一个基本版本。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
On the energy transfer of tsunamis generated by subaerial granular landslides: A 2D numerical analysis
Tsunamis generated by landslides represent a significant hazard in coastal, fjord and lake environments. Their accurate modeling, using both physical and mathematical models, is crucial for activities such as risk assessment and mitigation strategies. Both approaches can provide valuable insights on the physics of landslide-tsunamis; however, due to the very complex nature of the problem, more efforts are needed to further understand the basic process of tsunami generation and propagation. In this sense, the study of the problem from an energetic perspective can provide valuable information, especially focusing on the energy transfer mechanisms between landslides and water waves. This paper presents a two-dimensional (2D) numerical study aimed at the energy mapping of tsunamis generated by subaerial granular landslides. To this end, several parametric simulations are carried out with OpenFOAM®, systematically varying some selected governing parameters (landslide falling height, water depth, and slope angle). For each simulation, several dimensionless energy quantities were computed and analyzed to investigate the energy transfer mechanisms between the landslide and the water waves. Further, the ability of some parameters to describe the efficiency of the energy transfer process for tsunami generation and propagation is investigated. At least for the cases considered in this study, it appears that the shape of the landslide vertical front at the impact and the extent of the submerged path are more important than the landslide velocity at the impact in terms of tsunamis generation efficiency. Finally, synthetic energy quantities have been examined from a broader perspective to derive overall insights into the energy transfer process between subaerial granular landslides and tsunamis, leading to the formulation of a first basic version of a nondimensional energy wavemaker curve.
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来源期刊
Coastal Engineering
Coastal Engineering 工程技术-工程:大洋
CiteScore
9.20
自引率
13.60%
发文量
0
审稿时长
3.5 months
期刊介绍: Coastal Engineering is an international medium for coastal engineers and scientists. Combining practical applications with modern technological and scientific approaches, such as mathematical and numerical modelling, laboratory and field observations and experiments, it publishes fundamental studies as well as case studies on the following aspects of coastal, harbour and offshore engineering: waves, currents and sediment transport; coastal, estuarine and offshore morphology; technical and functional design of coastal and harbour structures; morphological and environmental impact of coastal, harbour and offshore structures.
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